This is a small planetary nebula that measures only 20 arc seconds in diameter.  Each pixel of resolution in my setup is only about .5 arc seconds.  Thus the nebula is only about 40 pixels in width.  This was taken with my RC14.5" at 3000mm.  

 

 

This is the same nebula taken by the Hubble

Date:  08-27-05

Telescope: RC14.5 at prime focus (F7.9)        Camera:ST10ME               

Exposure Time: RGB 15 minutes each 1bin

Processing: Maxim; Adobe combined, and knitted together.